What is having people conform with the customs, attitudes etc of an existing group?

Cultural Integration

Explanation:

The definition of "integrate" is "bring (people or groups with particular characteristics or needs) into equal participation in or membership of a social group or institution." The customs and attitudes of an existing group could be described as that group's culture, so it would be called "cultural integration."

- "a new era of american politics began with jackson's election in 1828, but it also completed a grand social experiment begun by the american revolution. nevertheless, jacksonian democracy represented a provocative blending of the best and worst qualities of american society."

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